Which one of the following electromagnetic radiation has the least wavelength?

In a Young's double-slit experiment, the screen is moved away from the plane of the slits. What will be its effect on the following?

(i) Angular separation of the fringes.

(ii) Fringe-width.

The energy of a photon of wavelength $$\lambda%$ is

The ratio of the nuclear densities of two nuclei having mass numbers 64 and 125 is